[Qemu-devel] [PATCH 1/6] linux-user: Recheck for pending synchronous signals too

[Peter Maydell <peter.maydell@linaro.org>]

In process_pending_signals() we restart the scan of possible
pending signals after calling handle_pending_signal() in
case some other signal has been generated. This rescan
should also include a check for a new synchronous signal
since those are in fact the only kind of new signal that
the signal frame setup process might produce.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 linux-user/signal.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/linux-user/signal.c b/linux-user/signal.c
index 85976da..87871ce 100644
--- a/linux-user/signal.c
+++ b/linux-user/signal.c
@@ -5925,6 +5925,7 @@ void process_pending_signals(CPUArchState *cpu_env)
         sigfillset(&set);
         sigprocmask(SIG_SETMASK, &set, 0);
 
+    restart_scan:
         sig = ts->sync_signal.pending;
         if (sig) {
             /* Synchronous signals are forced,
@@ -5952,8 +5953,10 @@ void process_pending_signals(CPUArchState *cpu_env)
                 (!sigismember(blocked_set,
                               target_to_host_signal_table[sig]))) {
                 handle_pending_signal(cpu_env, sig, &ts->sigtab[sig - 1]);
-                /* Restart scan from the beginning */
-                sig = 1;
+                /* Restart scan from the beginning, as handle_pending_signal
+                 * might have resulted in a new synchronous signal (eg SIGSEGV).
+                 */
+                goto restart_scan;
             }
         }
 
-- 
1.9.1